Re: [CAD_CAM_EDM_DRO] Re: Two Lamps?

On Monday 25 October 2004 02:13 pm, Torsten wrote:

> Thanks Dave, the Led I had bought for this
> is rated for regular 110 volt AC.
> I figured it would glow at least a little
> with the 55 volts DC.
> It worked fine straight of a 110 wall outlet.
> But I could not get it to work at all with
> the Powersupply.

That may include a capacitor, which won't work on DC at all.

> I did not know they only work in one direction
> maybe I try this again.
>
> Would I need a resistor for this?
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Dave Fisher" <dave@d...>
>
> wrote:
> > 2 lamps in series would be fine - but when 1 blows / dies both will
>
> go out !
>
> > LED's work fine with DC - BUT you do need a series resistor to
>
> limit the
>
> > current to about 10/15 milli Amp
> > - a good rule is about 820 Ohms for 12 Volts - So for 55 Volts
>
> 3,200 Ohms
>
> > should do the trick.
> >
> > Remember that LEDS are like diodes - they only work one way round
>
> on DC, so
>
> > if
> > it don't work this time - turn the LED connections arround.
> >
> > One more thing - If you have BIG caps in your power supply the LED
>
> could
>
> > well
> > stay on for a LONG time after you ditch the power !
> >
> > Rgds
> >
> > Dave Fisher UK
> >
> >
> > -----Original Message-----
> > From: Torsten [mailto:torsten@g...]
> > Sent: 25 October 2004 18:17
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subject: [CAD_CAM_EDM_DRO] Two Lamps?
> >
> >
> >
> >
> > Got a question, I have a Powersupply
> > delivering 55 volts DC in my driverbox
> > connected to a Caps to store and smuth
> > out the current having been zapped a few
> > times I would like to hook up a little
> > light bulb to drain out the current after
> > it is shut off.
> > Would also be nice for the visual feedback
> > to see when the thing is charged.
> >
> > On the first attempt I learned that a Led dose
> > not work with DC current.
> >
> > So now I am Looking at some Bulbs with a filament.
> > What I found is a "Miniature Bayonet base Lamp"
> > rated for 28 volt .040 amps I belive I should be
> > able to wire two of them in serial to make it work
> > on my 55 volt system.
> >
> > Will this work?
> > Any thoughts, please share.
> >
> >
> >
> >
> >
> >
> >
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> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
> sister site to the CCED group, as many of the same members are there, for
> OT subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
> DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill
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